Final answer:
The phenotype for a hair color genotype of (hh) would be blonde hair.
Step-by-step explanation:
In this case, the genotype for hair color is (hh) where brown hair is dominant and blonde hair is recessive. When an individual has a genotype of (hh), the phenotype would be blonde hair.
In the context of hair color inheritance, the genotype (hh) indicates that an individual has inherited the recessive allele (h) from both parents. Hair color is determined by the combination of alleles at specific genetic loci, and in this scenario, the presence of two recessive alleles results in the expression of the recessive trait, which is blonde hair.
The dominance and recessiveness of traits are fundamental concepts in Mendelian genetics. In this case, brown hair (H) is dominant, meaning that even one copy of the dominant allele is sufficient to express the dominant trait. Blonde hair (h), on the other hand, is recessive, requiring two copies of the recessive allele for the trait to be expressed.